Fabric and method of treating same



Cit

Patented Sept. 11, 1928.

.UNITED STATES PATENT OFFICE.

CLARENCE M. CARSON, OF AKRON, OHIO, ASSIGNOR TO THE GOODYEAR TIRE 86BUB- IBER COMPANY, OF AKRON, OHIO, .A CORPORATION OF OHIO.

FABRIC AND METHOD OF TREATING SAME.

No Drawing.

My invention relates to the treatment of fabrics and it.has for itsprimary object the provision of a method to render insoluble coatings ofimpervious material applied thereto.

therein.

A mixture of glue and glycerin has been employed for such coatings, butfilms of this character are objectionable since they are hygroscopic andare quickly deteriorated by atmospheric moisture which condenses uponthe outer surface of the bag.

I have discovered that coatings of this general nature may be renderedwaterproof by the application of a suitable fixing agent to the filmafter it has been applied to the The fabric may be coated, byany fabric.

desired means, with an impervious mixture,

such, for example, as

whigh is allowed to dry partially.

glue and glycerin,

Thereafter, the surface of the film is sprayed or painted with asolution of a suitable precipitating or tanning agent, such as sodiumalum, formaldehyde, or potassium d1- chromate. for use when dry.

The fabric so" treat-ed is ready Preferably, a solution having arelatively low concentration of the tanning agent is desirable; thus,when sodium alum is employed, the concentration should be between threeand five percent.

It has been found that a higher concentrationproduces a tendency for thefilm to shrink and thus allow the glycerin, or other softening agent, tocome to the surface, from which it can be dissolved by moisture.

This tendency may Application filed November 20, 1926. Serial no.149,796.

be minimized, even with the application of solutions of lowconcentration, by applying the tanning agent to the coated fabric on atentering frame similar to those employed in the textile industry. to

Various other coating materials may be employed in place of glueglycerin mixtures. Thus, other gasoline resistant materials, such ascasein or albumen, may be utili'lzed, and softening agents, such asTurkey red I. oil or ethylenesglycol, may be employed in place ofglycerin. In all cases it is believed that the insolubility results fromthe hardening by the tanning agent of the glue or other impervious film.

A coated fabric treated inthe foregoing manner may be readily.manufacturedand it is highly resistant to the effects of atmosphericconditions. The material may be handled in the field without the careheretofore employed,'because the film has a greater tenacity and is moreresistant to cracking, softening, or like defects, which would renderthe product unsatisfactory for use. Obviously, fabric so treated may beutilized for otherpurposes than breather bags, as, for example, in thepreparation of gasolineproof hose or the like. The foregoing examplesshouldbe regarded, therefore, as illustrative of the principles of the 7invention, and only such limitations should be imposed as are 'set forthin the following claim.

lVhat I claim is:

A method of treating fabrics for breather bags which comprises applyingto the fabric a gas-tight coating of proteinous material containing asoftening agent, partially drying the coating, stretching the fabricupon a frame,'applying a tanning solution thereto and completing theprocess of drying.

In witness whereof, I have hereunto signed my name.

CLARENCE M. CARSON.

